I have been trying to connect my Spark Core to my WiFi router but no success. I have factory reset the core, so LED started blinking Blue. WHen I tried to configure it using Android App, it couldn’t find core and core also kept blinking Blue. I also tried using USB but same issue.
Can someone guide me, how to connect this core to Cloud?
Have you had a look here already?
http://docs.spark.io/troubleshooting/
Especially check if your router settings comply.
OK, I was able to now send WiFI credentials, but it doesn’t go furher bu blinks Green. Any clue?
It is a new core that has never connected successfully to the 
?